* Important points about the charging by induction :- 1. Charge of a charged body will not change 2. If uncharged body is a conductor or metal then equal and opposite charge will be developed on the nearer face. 3. If uncharged body is not a metal then then induced charge will be less than inducing charge. 4. Induced charge can never be more than inducing charge. * charging by conduction : - It is a method of charging in which two bodies are touched together 1. If bodies are identical then after conduction charge on each body will be the half of the sum of the charge on both the body 2. If bodies are not identical then potential will decide the flow of charge from one body to the other * properties of charge : - 1. Quantisation of charge 2. Conservation of charge 3.. Additive nature of charge 4. charge is invariant with the speed * Quantisation of charge:- Total charge on a body is integral multiple of charge of elctron i.e. q= +ne or -ne Where n = 1,2,3..... E= 1.6* 10-19c *Conservation of charge:- Charge can niether be created nor be destroyed.But it can be transferred form one body to another. This law is obeyed by all the bodies microscopic as well as macroscopic bodies *Pair production: - In this gamma ray photon splits into the electron positron pairs * Additive nature of charge:- total charge on a body is the algebric sum of all the charges located on the body. * charge does not depend upon the speed of the body but depends upon the mass of the body. *Differences between the charge and the mass :- 1. Charge may be postive, negative or zero Whereas mass is always postive. 2. Force between two charge may be attractive or repulsive whereas force between two masses is always attractive in nature 3. Charge is quantised where as mass is not quantised so far. 4. Charge is conserved whereas mass is not conserved can be converted into energy i.e. E = MC*c 5. Charge does not depend upon the speed of the body where as mass depend upon the speed of the body 6. Charge without mass does not exist Where as mass without charge can exist. e.g. Neutron * Coulomb Law of the electrostatics : - it states that force of attraction or repulsion between any two charges is directly propotional to the product of their charges and inversely propotional to the square of the distance between them. F= kq1q2/r2 where k is propotionality constant K depends upon the system of units used and the nature of the medium is present between the two point charges.
Posted on: Mon, 17 Jun 2013 15:45:54 +0000
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